This is an impressive piece of software. I have just updated from the first version and the reflow is amazing. Yet, it can't solve all problems and with many PDFs I am stuck with a horizontal fit-to-width orientation.
Here is what troubles me since the first version. With some PDFs when I SHIFT+S and page down, all works fine - the rest of the current page is displayed. With some however, I jump to the next page directly, missing half of the previous page.
I tried to set the box by shift+x to the whole page, toggled the P option, nothing helps. But as I say, only some PDFs behave this way...